Which one of the following is not used for the construction of ecological pyramids?

Explanation

Ecological pyramids represent the trophic structure and trophic function of an ecosystem. In an ecological pyramid, the first trophic level forms the base, and successive trophic levels the tiers that make up the apex. Ecological pyramids may be of three general types, i.e. pyramids of numbers, pyramids of biomass, and pyramids of energy. The pyramid of biomass indicates the decrease or the gradual reduction in biomass at each trophic level from base to apex. Fresh weight is not used in ecological pyramids.